/*
 * Copyright (C) 2010-2018 Gordon Fraser, Andrea Arcuri and EvoSuite
 * contributors
 *
 * This file is part of EvoSuite.
 *
 * EvoSuite is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3.0 of the License, or
 * (at your option) any later version.
 *
 * EvoSuite is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with EvoSuite. If not, see <http://www.gnu.org/licenses/>.
 */

package org.evosuite.utils;

import org.apache.commons.lang3.StringEscapeUtils;
import org.evosuite.testcase.TestCodeVisitor;

/**
 * <p>
 * NumberFormatter class.
 * </p>
 *
 * @author Gordon Fraser
 */
public class NumberFormatter {

    public static String getNumberString(Object value) {
        return getNumberString(value, null);
    }

    /**
     * <p>
     * getNumberString
     * </p>
     *
     * @param value a {@link java.lang.Object} object.
     * @return a {@link java.lang.String} object.
     */
    public static String getNumberString(Object value, TestCodeVisitor visitor) {
        if (value == null)
            return "null";
        else if (value.getClass().equals(char.class)
                || value.getClass().equals(Character.class)) {
            // StringEscapeUtils fails to escape a single quote char
            if (Character.valueOf('\'').equals(value)) {
                return "'\\''";
            } else {
                return "'"
                        + StringEscapeUtils.escapeJava(Character.toString((Character) value))
                        + "'";
            }
        } else if (value.getClass().equals(String.class)) {
            return "\"" + StringEscapeUtils.escapeJava((String) value) + "\"";
        } else if (value.getClass().equals(float.class)
                || value.getClass().equals(Float.class)) {
            if (value.toString().equals("" + Float.NaN))
                return "Float.NaN";
            else if (value.toString().equals("" + Float.NEGATIVE_INFINITY))
                return "Float.NEGATIVE_INFINITY";
            else if (value.toString().equals("" + Float.POSITIVE_INFINITY))
                return "Float.POSITIVE_INFINITY";
            else if (((Float) value) < 0F)
                return "(" + value + "F)";
            else
                return value + "F";
        } else if (value.getClass().equals(double.class)
                || value.getClass().equals(Double.class)) {
            if (value.toString().equals("" + Double.NaN))
                return "Double.NaN";
            else if (value.toString().equals("" + Double.NEGATIVE_INFINITY))
                return "Double.NEGATIVE_INFINITY";
            else if (value.toString().equals("" + Double.POSITIVE_INFINITY))
                return "Double.POSITIVE_INFINITY";
            else if (((Double) value) < 0.0)
                return "(" + value + ")";
            else
                return value.toString();
        } else if (value.getClass().equals(long.class)
                || value.getClass().equals(Long.class)) {
            if (((Long) value) < 0)
                return "(" + value + "L)";
            else
                return value + "L";
        } else if (value.getClass().equals(byte.class)
                || value.getClass().equals(Byte.class)) {
            if (((Byte) value) < 0)
                return "(byte) (" + value + ")";
            else
                return "(byte)" + value;
        } else if (value.getClass().equals(short.class)
                || value.getClass().equals(Short.class)) {
            if (((Short) value) < 0)
                return "(short) (" + value + ")";
            else
                return "(short)" + value;
        } else if (value.getClass().equals(int.class)
                || value.getClass().equals(Integer.class)) {
            int val = (Integer) value;
            if (val == Integer.MAX_VALUE)
                return "Integer.MAX_VALUE";
            else if (val == Integer.MIN_VALUE)
                return "Integer.MIN_VALUE";
            else if (((Integer) value) < 0)
                return "(" + value + ")";
            else
                return "" + val;
        } else if (value.getClass().isEnum() || value instanceof Enum) {
            // java.util.concurrent.TimeUnit is an example where the enum
            // elements are anonymous inner classes, and then isEnum does
            // not return true apparently? So we check using instanceof as well.

            String className;
            Class<?> enumClass = value.getClass();
            if (enumClass.isAnonymousClass()) {
                enumClass = enumClass.getEnclosingClass();
            }

            if (visitor != null) {
                className = visitor.getClassName(enumClass);
            } else {
                Class<?> clazz = enumClass;
                className = clazz.getSimpleName();
                while (clazz.getEnclosingClass() != null) {
                    String enclosingName = clazz.getEnclosingClass().getSimpleName();
                    className = enclosingName + "." + className;
                    clazz = clazz.getEnclosingClass();
                }
            }

            // We have to do this here to avoid a double colon in the TimeUnit example
            if (!className.endsWith("."))
                className += ".";
            try {
                if (value.getClass().getField(value.toString()) != null)
                    return className + value;
                else if (((Enum<?>) value).name() != null)
                    return className + ((Enum<?>) value).name();
                else
                    return "Enum.valueOf(" + className + "class, \"" + value + "\")";
            } catch (Throwable t) {
                if (((Enum<?>) value).name() != null)
                    return className + ((Enum<?>) value).name();
                else
                    return "Enum.valueOf(" + className + "class /* " + t + " */, \"" + value + "\")";
                // return className + "valueOf(\"" + value + "\")";
            }
        } else if (value.getClass().equals(Boolean.class)) {
            return value.toString();
        } else {
            // This should not happen
            assert (false);
            return value.toString();
        }
    }

    /**
     * <p>
     * getBoxedClassName
     * </p>
     *
     * @param value a {@link java.lang.Object} object.
     * @return a {@link java.lang.String} object.
     */
    public static String getBoxedClassName(Object value) {
        if (value.getClass().equals(Double.class))
            return "double";
        else if (value.getClass().equals(Float.class))
            return "float";
        else if (value.getClass().equals(Long.class))
            return "long";
        else if (value.getClass().equals(Boolean.class))
            return "boolean";
        else if (value.getClass().equals(Short.class))
            return "short";
        else if (value.getClass().equals(Integer.class))
            return "int";
        else if (value.getClass().equals(Byte.class))
            return "byte";
        else if (value.getClass().equals(Character.class))
            return "char";
        else
            return value.getClass().getSimpleName();

    }

}
